24th June 2023
Arculator 2.2 released.

• New podules: Acorn AEH50 Ethernet II, Acorn AEH54 Ethernet III, Acorn AKA32 SCSI Podule, Design IT Ethernet 200 Morley A3000 User and Analogue Port, Risc Developments High Density Floppy Controller
• Support for HFE v3 and SCP disc images
• Integrated debugger
• Optimisations
• Bugfixes

5th September 2021
Arculator 2.1 released.

• New podules : Acorn AKA05 ROM Podule, Acorn AKA10 IO Podule (w/AKA15 MIDI Upgrade), Acorn AKA16 MIDI Podule, Aleph One 386PC/486PC Podule, Computer Concepts ColourCard, State Machine G16 Graphics Accelerator, Oak 16 Bit SCSI Interface
• Minipodule support for A30x0/A4000. Currently included : Acorn AKA12 MIDI/IO Podule, ICS A3INv5 IDE Interface, ZIDEFS IDE Interface
• Added A4 laptop emulation
• Added A500 prototype emulation
• Added HFE disc image support (read/write)
• Fixed MEMC1 timing
• Bugfixes

9th November 2019
Arculator 2.0 released.

• FPA10 emulation
• Podule emulation. Current included podules : AKA31 SCSI Podule, AKD52 Hard Disc Podule, Computer Concepts Lark, HCCS Ultimate CD-ROM, ICS ideA, RISC Developments IDE Podule, Wild Vision MIDI Max, ZIDEFS
• Much better CPU/memory timing. Now emulates ARM3 cache and MEMC1/MEMC1a timings
• Added emulation of GamesPad, RTFM and Serial Port/Vertical Twist joysticks
• Improved sound filter emulation
• Re-implemented FDI support
• Added HostFS (ported from RPCemu)
• Disc drive noise
• Linux port
• Numerous bug fixes
• Many other changes

26th May 2010
All RPCemu development has moved to http://www.marutan.net/rpcemuspoon/. This is because the only branch still doing anything is the one with the silly name.

15th August 2009
Arculator 0.99 released.

• ICS IDE interface emulated, when new FDC is not in use
• Improved IOC mapping, improvements on !PCem, NetBSD etc
• ArculFS now read/write, and now ROM based
• Sound improved a little
• Can now disable all video borders
• SWPB now works, also corrected SWP and MUL encoding - Fire & Ice now works
• Return of FDI support
• ADP protected disc image support
• FDC improvements
• High-res mono monitor emulation (1152x896)
• A3010 joystick emulation

23rd March 2008
I've added a donation link on the left, explanations as to why are on the relevant page.

16th June 2007
RPCemu 0.7 released.

• New dynamic recompiler CPU core - between 2 and 4 times the speed of the interpreter, depending on machine, applications etc
• RISC OS 4 now works properly with lazy task swapping on recompiler
• CD-ROM support. .ISO images on all platforms, direct drive access on Windows and Linux
• Now supports hard disc images above 2gb - the new limit is 32gb
• New DOS port
• Now compiles and (mostly) works on big-endian machines (eg PowerPC Macintosh)
• Source code improved a bit

10th June 2007
Arculator 0.9a released.

6th February 2007
Arculator 0.9 released.

• Fixed ARM bugs - Bug Hunter now works, Phaethon no longer crashes on level 3
• Fixed bug in 82c711 - Nebulus now works on new FDC
• Fixed timing in modes 48/49
• Various optimisations
• Can now emulate ARM3 at 33mhz
• Now emulates two hard discs
• Removed software scaling options - improvements to hardware scaling mean these are not necessary anymore
• Improved FDI support in new FDC - more games supported (eg Wolf 3d, SF3000 etc) with hard disc install
• Mouse & keyboard shouldn't lock up in some stuff anymore
• Some other fixes

26th December 2006
RPCemu 0.6 released.

• Working StrongARM emulation
• Changed timing system, sound much more stable
• Moved blitting to seperate thread, big speed boost in some stuff on dual core/hyperthreading CPUs
• Optimisations to ARM + memory, speed boost between 10% and 25%
• Fixed abort handling and MSR/MRS in 26-bit modes, more stuff now works, eg Ankh, Blu, Era, Reactivity, RISC OS 6
• Changes to MMU permissions, ArmLinux now starts (but doesn't run yet)
• Crash bug fixed in 32-bit colour
• Can now alter video refresh rate from the default of 60hz
• Better mouse support in Linux
• Early GUI in Linux
• Linux port now works on x86-64
• Fullscreen mode (Windows only)

23rd October 2006
Arculator 0.8 released.

• Improved timing. Each model now performs much closer to the original machines (this means slower than previous versions)
• Can now emulate MEMC page sizes other than 32k, so all memory configurations from 512k to 16 megs are now possible
• Preliminary FDI support in 82c711 FDC
• Better FDI support in WD1772 FDC
• Fast disc emulation in 82c711 FDC
• Bugfixes to video code. Man United Europe now looks better. Less flicker in Populous, Zarch etc
• Keyboard/mouse fix, now doesn't freeze in Lemmings 2 and some other games
• Fixed broken sound in Sensible Soccer and Xenon 2
• Sound now in stereo
• Some minor optimisations
• Seperate ROM + CMOS files for Arthur, RISC OS 2, RISC OS 3 (old FDC) and RISC OS 3 (new FDC)
• Tracked WD1772 hanging bug down to an incorrectly set CMOS bit! Now fixed

17th July 2006
RPCemu 0.51 released.

28th June 2006

27th June 2006
RPCemu 0.5 released.

• Optimised flag emulation, outer loop, pipeline refilling - 30% speed increase
• Couple of new instructions - latest Artworks Viewer now runs
• Bugfix in IOMD timers - !ArcQuake and !SICK now work
• Bugfix in MMU - large memory configurations work with all OSes now
• Bugfix in dirty buffering - no more display artifacts
• Windows interface slightly better
• Added workaround for blitting issues on some graphics cards
• Preliminary sound emulation (Windows 9x only)

9th May 2006
Arculator 0.7 released.

• Improved video code - display always centred correctly, multisync mode support (eg 640x480, 640x512 and 800x600), borders always drawn correctly (eg Zelanites)
• Fixed bug with LDMxx!, !NewLook now works, Arthur desktop now works
• Fixed bug in WD1772 FDC, disc writing now works again
• Some improvements to ArculFS

28th April 2006
Arculator 0.6 released.

• Improved FDI support - many more games work
• Improved video routines - new hardware scaling option, faster! Also more video modes implemented
• ArculFS - read files from the Windows file system (read-only at the moment)
• Can emulate ARM250

27th March 2006
RPCemu 0.4 released.

• Fixed stupid bug with flyback bit in IOMD control register - RiscOS 3.x nowstarts up correctly every single time (why did XXXX X work?)
• Rewritten video emulation - now supports 16-bit & 32-bit colour, has correctly coloured cursor, some video acceleration, etc.
• HostFS - allows access of the Windows filesystem from RISC OS
• Now supports 2 hard discs
• Now supports >16 megs RAM, and VRAM
• Now licensed under the GPL
• Preliminary Linux port, thanks to Peter Naulls

23rd January 2006
Arculator 0.5 released.

• Working 82c711 emulation. This allows high density disc access and avoids the hanging bug in 1772 emulation
• Along with 82c711 emulation comes IDE hard disc emulation
• Preliminary FDI support (1772 only)
• Increased frequency of keyboard/mouse updates - mouse now much smoother
• Slight optimisations to video

11th January 2006
RPCemu 0.3 released.

• Fixed up various 32-bit problems in the ARM core, XXXX XX X now works
• IDE hard disc emulation
• Fixed bugs in floppy emulation
• Added emulation of ARM610 and ARM710
• Low video resolutions (eg 320x480) now supported better
• Faked sound interrupts (not enough for !Replay, but enough to fool Dune II)

4th January 2006
RPCemu 0.2 released.

• Ignored all unimplemented memory accesses, including Econet - RiscOS 3.7 now works
• 70% speed increase
• CMOS now actually saves
• Cursor now correct colours
• Less restrictive ROM loading

26th December 2005
RPCemu 0.1 released.

An early release, but a lot of software works already.

14th November 2005

12th October 2005
Arculator 0.4 released.

• Delayed IRQ by one instruction - Lemmings 2 now has sound.
• Fast disc access.
• Can disable scanline effect.

5th October 2005
Arculator 0.35 released.

• Fixed reading of R15 in some instructions - Nebulus now works.
• Sound improved a bit.
• Fixed RSC instruction (don't think it affects anything though).
• Altered ARM timing.
• Beginnings of new-style Arc emulation (HD floppies + IDE hard discs in theory, not working yet though).
• Palette splits slightly more stable (Lotus 2).

22nd August 2005
Arculator 0.3 released.

• Much improved sound (filter still a bit off though).
• Slight ARM optimisations - 10% speedup.
• Bug fixes to VIDC and IOC - TCD Powerscroll and ARMageddon Megademo 3 now work.
• Emulated prefetch - Elite now works (stupid protection).
• Fixed stupid video mode 0 bug.
• Replaced mouse hack with mouse capture technique.

22nd July 2005
Arculator 0.25 released.

• Disc emulation improved - can now access 720k DOS disc images, write to discs, and up to 4 drives now supported.
• Arculator will now try to load a 2 meg file called 'rom.rom' before trying ic24-ic27.rom. This allows use of one-file ROM dumps, and Arthur, RiscOS 2 and ARM Linux ROM dumps (none of which really work, but never mind).
• Slight changes to video emulation, Zelanites demo now looks okay.
• Slight ARM optimisations.

I'm on the lookout for documentation on the ST-506 controller (HD63463) and/or the A540 SCSI controller. If anyone has documentation on these chips then please email me.

28th June 2005
Arculator 0.2 released.

• Added support for dual/quad MEMCs (8 and 16 megs of RAM).
• ARM3 emulation.
• ARM & video optimisations - 25% speed boost.
• Rewritten video emulation - support midscreen palette/mode changes, correct cursor in 256 colour modes, better scrolling in hardware scrolling games, etc.
• Reduced sound lag and improved sound overall.
• Added fullscreen mode.

22nd May 2005
Arculator 0.1 released.

• Couple of CPU bugs fixed - Disc access now okay (hack no longer required), many more programs/games run.
• Hack to work around other CPU bug.
• Better video emulation - more modes, scrolling in James Pond and Chuck Rock, correct scrolling in supervisor.
• New attempt at sound (quite poor).
• Better mouse emulation.